Unfinished wiring job

a volunteer refurbished a restroom for our club and moved from the area before he completed the job.
There is a whole in the drywall and three bare wires are showing (the wire color must be on the other side of the plastic box attached to a stud.
Without take the wall apart is there a way to test the wires so I can tell which is black, white and green?
I have a micronta multitester to use.
Neil
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Neil Harris wrote:

Doesn't really matter--if you can't get anything except already stripped wire into the handybox, you're going to have to fix that problem any way. You should only have enough stripped on the ends to make the connection to the outlet/switch/whatever is to go in the box. (And, no, wrapping the exposed ends w/ tape is sufficient.)
If this "volunteer" left such a situation here, I'd be quite concerned about what else he did (or didn't do)...
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Are you sure there are not more wires tucked inside the box? Perhaps wires/box is partially covered with wall paint and/or plaster? Are they bare all the way through the box and behind? If the wires are completely bare then they are probably all ground wires. If not then you have big trouble. What was the purpose of the restoration? Were circuits added or was he adding grounds to existing 2 wire circuits?
Kevin
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Kevin Ricks wrote: ...

Good idea--I didn't consider the possibility he might have just had a ground connection location...
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Let me just throw this in there - if there's an electrical fire and someone is killed, insurance will not cover the club because the club was negligent.
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